Hei cha: Liu Bao, Fuzhuan and other dark teas

Hei cha (黑茶) refers to dark teas in which microbial fermentation is important to processing. Examples include Liu Bao, Fuzhuan and other regional teas. Woody, earthy or sweet notes vary by product; the category has no single flavour.

Liu Bao with visible yellow “jin hua” spots. A photograph alone cannot establish whether tea is safe to drink.
Photo: Cosmin Dordea · CC BY-SA 2.0

Styles to explore

Liu Bao originates in Liubao town, Cangwu County, Wuzhou, Guangxi. Descriptions often mention wood and aged notes, sometimes bing lang xiang, a traditional term meaning areca-nut aroma. This describes a smell, not added areca nuts.

Hunan produces Anhua brick teas and Qian Liang Cha cylinders; Fuzhuan is also made in other regions. Sichuan has Zang Cha and Hubei has Qing Zhuan. Compare samples rather than assuming any old Liu Bao is cheaper or better than ripe pu-erh.

Where pu-erh fits

Ripe pu-erh undergoes wet piling and is close to hei cha in processing. Raw pu-erh is made from sun-dried maocha without that stage and changes during storage. Classification accounts differ; for buying, knowing whether it is raw or ripe and how it was processed and stored is more useful.

Hong cha, usually called black tea in English, is a different category whose defining processing stage is enzymatic leaf oxidation.

Golden flowers

Fuzhuan production encourages Aspergillus cristatus, also known as Eurotium cristatum. Its yellow structures are called jin hua, or golden flowers. They are a feature of certain products, not a universal quality mark for tea.

Colour or a photograph cannot reliably identify a fungus or establish safety. If an unexpected growth or signs of damp appear on your stored tea, do not taste it to check. Consult the maker; discard clearly spoiled tea. Rinsing or boiling will not make spoiled tea safe to drink.

Brewing

Start with 4–5 g per 100 ml at 95–100 °C. Allow 10–15 seconds from starting to fill to starting to pour, then drain fully. A tightly compressed piece may take longer to soften. A brief rinse is optional; two discarded infusions are not compulsory.

Adjust subsequent times to taste and use fewer leaves if it is too strong. For simmering, follow a maker’s recipe and use only stovetop-rated cookware; an ordinary glass teapot may not be suitable.

Storage

Protect tea from damp, direct sun, heat and odours, following instructions for the particular product. Do not moisten your tea or leave it exposed to kitchen air to speed up ageing. Storage conditions matter more than a promise that older is better.

Dark tea contains caffeine. A smooth taste does not automatically make it suitable for evenings or an empty stomach; pay attention to how you respond.

Questions and answers

Is Fuzhuan a probiotic drink?

A fungus participating in production does not make the brewed tea a proven probiotic product. Choose it for enjoyment rather than as a treatment.

Can dark tea spoil?

Yes. Fermentation during production does not protect it against later moisture, contamination or mould. Ageing does not guarantee improvement either.